I had the same problem after upgrading but after I changed my jquery enqueue code (in my functions.php file) to:
if (!is_admin()) add_action("wp_enqueue_scripts", "my_jquery_enqueue", 11);
function my_jquery_enqueue() {
wp_deregister_script('jquery');
wp_register_script('jquery', "http" . ($_SERVER['SERVER_PORT'] == 443 ? "s" : "") . "://ajax.googleapis.com/ajax/libs/jquery/1.7.1/jquery.min.js", false, null);
wp_enqueue_script('jquery');
}
it worked!
I suppose the problem was that since my theme was loading an older version of jquery(1.4) it couldn’t work as the updated version runs on newer jquery
Hope that helps.